The ASTER instrument on NASA's Terra spacecraft captured this image of a massive iceberg from Greenland's Petermann Glacier on Aug. 12, 2010. The iceberg could eventually interfere with the flow of sea ice out of the Arctic and could ultimately be a threat to shipping. Image Credit: NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team  

On Aug. 5, 2010, an enormous chunk of ice, about 251 square kilometers (97 square miles) in size, or roughly four times the size of Manhattan, broke off the Petermann Glacier along the northwestern coast of Greenland. The Petermann Glacier lost about one-quarter of its 70-kilometer-long (40-miles) floating ice shelf, according to researchers at the University of Delaware, Newark, Dela. The recently calved iceberg is the largest to form in the Arctic in 50 years. 

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